package Thread;
//懒汉模式的单例模式
class SingletonLazy{
    private volatile static SingletonLazy instance=null;
    public static Object locker=new Object();
    public static SingletonLazy getInstance(){
        if (instance==null){
            synchronized (locker){
                if (instance==null){
                    instance=new SingletonLazy();
                }
            }
        }
            return instance;
    }
    private SingletonLazy(){

    }
}
public class Demo7 {
    public static void main(String[] args) {
        SingletonLazy s1=SingletonLazy.getInstance();
        SingletonLazy s2=SingletonLazy.getInstance();
        System.out.println(s1==s2);
    }
}
